Add Capture & Replay dashboard with dynamic stage

[jugal-chauhan]

Description

This PR adds a new CaptureReplayDashboard class in capture-replay-dashboard.ts to encapsulate CloudWatch dashboard logic. It enables dynamic loading of dashboard configurations from migrationassistant-capture-replay-dashboard.json, allowing modifications without code changes. It implements stage parameter injection to filter metrics based on the deployment stage, defaulting to 'dev'. It introduces error handling to ensure a fallback to a default configuration if the JSON file is missing or invalid. Additionally, it updates migration-assistance-stack.ts to deploy the dashboard conditionally based on the trafficReplayerServiceEnabled flag in cdk.context.json, supporting more flexible deployment scenarios.

Issues Resolved

MIGRATIONS-2133

Testing

Work in Progress

Check List

• New functionality includes testing
• Public documentation issue/PR created, if applicable.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[jugal-chauhan]

PR is still under 'work in progress'
Require more clarity on testing this change

[lewijacn]

Check my comments, I mentioned some ways to minimize the code here and keep a consistent pattern

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.91%. Comparing base (342d7df) to head (7f8b731).
Report is 74 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1322      +/-   ##
============================================
+ Coverage     79.45%   79.91%   +0.46%     
+ Complexity     3224     2977     -247     
============================================
  Files           459      443      -16     
  Lines         16837    16217     -620     
  Branches       1109     1087      -22     
============================================
- Hits          13377    12960     -417     
+ Misses         2790     2617     -173     
+ Partials        670      640      -30     

Flag	Coverage Δ
unittests	79.91% <ø> (+0.46%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[jugal-chauhan]

Tested the dashboard on my account with a simple end to end migration. Screenshots attached below.
Please do review these widgets

[lewijacn]

Thanks for simplifying this, added a couple more comments for things I noticed

[lewijacn]

I see a couple checks are failing, one for CDK tests and one for Jenkins deployment. The fix I mentioned should help with Jenkins deployment but CDK tests will probably need to be updated

[jugal-chauhan]

The Capture and Replay Dashboard upon CDK deployment looks like this. Screenshots have been pasted below.

[lewijacn]

LGTM, thanks for all the changes!